Learn to appreciate basic life necessities, learn to appreciate all the things you currently have, learn to reuse as much material as you possibly can.
Don't buy a new phone as soon as your old one starts to show some sings of getting older, don't buy a new car if your old one can still drive you to a desired destination and for God's sake, don't compare your lifestyle with someone who spends money and shows if off.
This will severely cut your spendings to just only essencial things like food, water, rent and let you save some money from just not spending it. And for bonus, this can lead to let you appreaciate the small things in your life